Question

Plz solve Q.no.3
I need the answer

Answer 1

Heya!!!

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Sin 4x × Cos 3x =

1/2 { Sin ( 4x + 3x ) + Sin ( 4x - 3x ) }

=>

1/2 { Sin 7x + Sin x }

So, it's integration is

-1/2 { (Cos 7x)/7 + Cos x }